JP2005508748A - Method of freezing and pulverizing waste resources using cooling gas - Google Patents

Method of freezing and pulverizing waste resources using cooling gas Download PDF

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JP2005508748A
JP2005508748A JP2003543797A JP2003543797A JP2005508748A JP 2005508748 A JP2005508748 A JP 2005508748A JP 2003543797 A JP2003543797 A JP 2003543797A JP 2003543797 A JP2003543797 A JP 2003543797A JP 2005508748 A JP2005508748 A JP 2005508748A
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gas
freezing
waste
frozen
refrigeration
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スン ジン ホン
クワン ホ チョイ
キュ ドン リー
カン ヨン リョオ
ジャン ホ リー
ジン ヨン イム
キュン シク ション
イー ホー ハン
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Kolon Construction Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0404—Disintegrating plastics, e.g. by milling to powder
    • B29B17/0408—Disintegrating plastics, e.g. by milling to powder using cryogenic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Abstract

【課題】液化石油ガスを冷却源として利用することにより廃タイヤ、廃ゴム、廃プラスチックなどの廃資源を冷凍粉砕して、再使用可能な粉末形状の原料を最小の費用で得ることができる廃資源の冷凍粉砕方法を提供する。
【解決手段】廃資源の冷凍粉砕方法において、液化石油ガスと冷却気体との熱交換過程において液化石油ガスの冷凍熱源を回収することにより冷凍気体が最初に生成され、その冷凍気体を冷凍槽に供給することにより、この冷凍槽に保存された廃資源を粉砕しやすい温度まで冷凍する。次に、冷凍された廃資源を粉砕装置において粉砕して、その後、この粉砕された廃資源を分離装置に投入して、粉砕された廃資源から冷凍気体を分離して、この分離された冷凍気体を再使用できるように回収する。Waste that can be reused by using liquefied petroleum gas as a cooling source to freeze and grind waste resources such as waste tires, waste rubber, and waste plastics, and to obtain a reusable powder-shaped raw material at a minimum cost A method for freezing and pulverizing resources is provided.
In a method for freezing and pulverizing waste resources, a refrigeration gas is first generated by recovering a refrigeration heat source of the liquefied petroleum gas in a heat exchange process between the liquefied petroleum gas and the cooling gas, and the frozen gas is supplied to a freezing tank. By supplying, the waste resources stored in this freezing tank are frozen to a temperature at which it can be easily crushed. Next, the frozen waste resource is pulverized in a pulverizer, and then the pulverized waste resource is put into a separator to separate the frozen gas from the pulverized waste resource. Collect the gas for reuse.

Description

本発明は冷凍気体を利用した廃資源の冷凍粉砕方法に関し、さらに詳しくは液化石油ガスから得られた冷凍気体を廃資源及び冷凍粉砕された廃資源に供給して再使用可能な粉末形状の原料を効果的に得ることができる廃資源の冷凍粉砕方法に関する。   TECHNICAL FIELD The present invention relates to a method for freezing and pulverizing waste resources using frozen gas, and more particularly, a powder-shaped raw material that can be reused by supplying frozen gas obtained from liquefied petroleum gas to waste resources and frozen and ground waste resources. The present invention relates to a method for freezing and pulverizing waste resources.

一般に、廃タイヤ、廃ゴム、廃プラスチックなどのような廃資源が回収され、粉末形状に粉砕可能な温度に冷凍されることによって再使用されることが知られている。   In general, it is known that waste resources such as waste tires, waste rubber, waste plastics, etc. are recovered and reused by freezing them to a temperature that can be pulverized into a powder form.

廃資源を粉末形状に粉砕する方法は、高温粉砕方式と冷凍粉砕方式とに分類できる。冷凍粉砕方式において、液体窒素又は液化石油ガスが冷凍源として利用される。   The method of pulverizing waste resources into a powder form can be classified into a high-temperature pulverization method and a freeze pulverization method. In the freeze pulverization method, liquid nitrogen or liquefied petroleum gas is used as a refrigeration source.

高温粉砕方式において、廃資源が冷凍工程を経ることなく、摩擦式粉砕機によって粉砕され、再使用可能な粉末形状の原料を得ることができる。冷凍粉砕方式において、各種冷凍媒体により、廃資源が冷凍粉砕され、再使用可能な粉末形状の原料を得ることができる。   In the high-temperature pulverization method, waste resources are pulverized by a friction pulverizer without going through a freezing step, and a reusable powder-form raw material can be obtained. In the freeze pulverization method, waste resources are frozen and pulverized by various refrigeration media, and a reusable powder-form raw material can be obtained.

しかしながら、高温粉砕方式は、装置投資費が安い反面、この装置を稼動するための動力を多く消費するので維持費が高い。さらに、廃資源中に含まれている異物の分離が難しいため、再使用可能な粉末の純度が低下し、廃資源の再使用率が低い。加えて、この粉末は、摩擦熱によって熱変性するので、この再使用可能な粉末でできた２次加工物の品質が劣化する。   However, the high-temperature pulverization method has a low maintenance cost because the investment cost for the apparatus is low, but a large amount of power is required to operate the apparatus. Furthermore, since it is difficult to separate the foreign substances contained in the waste resources, the purity of the reusable powder is lowered and the reuse rate of the waste resources is low. In addition, since the powder is thermally denatured by frictional heat, the quality of the secondary workpiece made of the reusable powder is degraded.

液体窒素ガスを利用する冷凍粉砕方式において、超低温状態で廃資源を粉砕するので、廃資源が変性せず、高品質の再使用可能な粉末形状の原料を得ることができる。しかしながら、液体窒素を使用するために再使用にかかる費用が増加するという問題点がある。   In the freezing and pulverizing method using liquid nitrogen gas, waste resources are pulverized in an ultra-low temperature state, so that the waste resources are not denatured and a high-quality reusable raw material in powder form can be obtained. However, since liquid nitrogen is used, there is a problem that the cost for reuse increases.

加えて、液化石油ガスを利用する冷凍粉砕方式において、廃資源は、熱交換を通じて冷凍された熱交換媒体に浸漬されることにより冷凍された後、粉砕される。冷凍過程と粉砕過程の間の期間において熱交換媒体と廃資源との分離が完全に行われなければならない。しかしながら、この期間中に、冷凍された廃資源は解凍状態になる可能性があり、これにより、冷凍粉砕工程を遂行することが不可能になる。即ち、廃資源から熱交換媒体を完全に分離することは不可能となる。   In addition, in the freezing and pulverization method using liquefied petroleum gas, waste resources are frozen by being immersed in a heat exchange medium frozen through heat exchange and then pulverized. In the period between the freezing process and the grinding process, the separation of the heat exchange medium and the waste resources must be done completely. However, during this period, the frozen waste resources can be in a thawed state, which makes it impossible to perform the freeze grinding process. That is, it is impossible to completely separate the heat exchange medium from the waste resources.

特に、この粉末と熱交換媒体との接触面積が大きい場合、上述した問題はより一層深刻となる。それ故に、廃資源を冷凍状態で粉砕するためには、粉末と熱交換媒体が一緒に粉砕装置に供給されるべきであるので、熱交換媒体の損失は避けられない。   In particular, when the contact area between the powder and the heat exchange medium is large, the above-described problem becomes even more serious. Therefore, in order to grind waste resources in the frozen state, the powder and the heat exchange medium should be supplied together to the grinder, so the loss of the heat exchange medium is inevitable.

本発明は、上述した問題点を解決するために案出されたものである。   The present invention has been devised to solve the above-described problems.

本発明の目的は、液化石油ガスを冷凍源として利用することにより、廃タイヤ、廃ゴム、廃プラスチックなどの廃資源を冷凍粉砕して再使用可能な粉末形状の原料を最小の費用で得ることができる廃資源の冷凍粉砕方法を提供することにある。   The object of the present invention is to use liquefied petroleum gas as a refrigeration source to freeze and grind waste resources such as waste tires, waste rubber, and waste plastics to obtain a reusable powder-form raw material at a minimum cost. It is to provide a method for freezing and pulverizing waste resources.

上述の目的を達成するために、本発明によれば、液化石油ガスと冷却気体との熱交換過程において液化石油ガスの冷凍熱源を回収することにより、冷凍気体を生成する冷凍気体生成工程と、前記冷凍気体を冷凍槽に供給することにより、該冷凍槽に保存された廃資源を粉砕しやすい温度まで冷凍する冷凍工程と、前記冷凍された廃資源を粉砕装置において粉砕する粉砕工程と、前記粉砕された廃資源を分離装置に投入して該投入された廃資源から冷凍気体を分離して、該分離された冷凍気体を再使用できるように回収する冷凍気体回収工程とを含む廃資源の冷凍粉砕方法が提供される。   In order to achieve the above-mentioned object, according to the present invention, a refrigeration gas generation step of generating a refrigeration gas by recovering a refrigeration heat source of the liquefied petroleum gas in a heat exchange process between the liquefied petroleum gas and the cooling gas, By supplying the frozen gas to a freezing tank, a freezing step of freezing the waste resources stored in the freezing tank to a temperature at which it can be easily ground, a grinding step of grinding the frozen waste resources in a grinding device, A waste gas resource including a frozen gas recovery step of supplying the pulverized waste resource to a separation device, separating the frozen gas from the input waste resource, and recovering the separated frozen gas so that it can be reused. A method of freeze grinding is provided.

冷凍気体は、−１７０℃で気体状態を維持できる気体、即ち、窒素、酸素、及びこれらを混合した混合気体から成る群から選択された気体で構成される。   The frozen gas is composed of a gas that can maintain a gaseous state at −170 ° C., that is, a gas selected from the group consisting of nitrogen, oxygen, and a mixed gas obtained by mixing these.

冷凍工程は、冷凍槽における廃資源に冷凍気体を噴霧して廃資源を流動させて冷凍効率を最大にする噴霧工程を含む。   The refrigeration process includes a spraying process that maximizes refrigeration efficiency by spraying frozen gas onto waste resources in the freezing tank to flow the waste resources.

この方法は、冷凍気体回収工程後、粉砕された廃資源に含まれた異物を比重差によって除去する異物除去工程をさらに含んでいてもよい。   This method may further include a foreign matter removing step of removing the foreign matter contained in the pulverized waste resource by the specific gravity difference after the frozen gas recovery step.

粉砕工程は、冷凍気体を粉砕装置に供給することによって、粉砕工程において発生する熱を除去して粉砕効率を最大にする熱除去工程を含む。   The pulverization step includes a heat removal step that maximizes the pulverization efficiency by removing the heat generated in the pulverization step by supplying frozen gas to the pulverizer.

本発明による廃資源の冷凍粉砕方法によれば、液化石油ガスを消費部に供給するために蒸発させる過程において熱交換されて廃棄される液化石油ガスの冷凍熱源を回収して、廃タイヤ、廃ゴム、廃プラスチックの再使用のための冷凍源として使用するので、再使用するための費用を最小にすることができる。   According to the method for freezing and pulverizing waste resources according to the present invention, a refrigeration heat source for liquefied petroleum gas that is heat-exchanged and discarded in the process of evaporating to supply liquefied petroleum gas to a consumption unit is recovered, and waste tires, Since it is used as a refrigeration source for the reuse of rubber and waste plastic, the cost for reuse can be minimized.

以下、本発明の好ましい実施の形態を添付した図面を参照してさらに詳細に述べる。   Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

図１は、本発明の実施の形態に係る冷凍気体を利用した廃資源の冷凍粉砕方法を示す。   FIG. 1 shows a method for freezing and pulverizing waste resources using frozen gas according to an embodiment of the present invention.

図１において、第一超低温ポンプ６は、液化石油ガス貯蔵タンク２内に設置されている。第一超低温ポンプ４は、液化石油ガスを第二超低温ポンプ６に供給する。この第二超低温ポンプ６は、海水を利用した気化用熱交換システム８に液化石油ガスをさらに供給する。第二超低温ポンプ６を気化用熱交換システム８に接続する導管に分岐管B１を配置して高圧の液化石油ガスを冷凍源回収用熱交換システム１０に供給してこの液化石油ガスを気化させる。この石油ガスは排出管B２を通じて主管Ｐに供給して熱交換システム８において生成された石油ガスと共に消費部に供給される。   In FIG. 1, the first ultra-low temperature pump 6 is installed in the liquefied petroleum gas storage tank 2. The first ultra-low temperature pump 4 supplies liquefied petroleum gas to the second ultra-low temperature pump 6. The second ultra-low temperature pump 6 further supplies liquefied petroleum gas to the heat exchange system 8 for vaporization using seawater. A branch pipe B1 is arranged in a conduit connecting the second ultra-low temperature pump 6 to the vaporization heat exchange system 8, and high-pressure liquefied petroleum gas is supplied to the refrigeration source recovery heat exchange system 10 to vaporize the liquefied petroleum gas. This petroleum gas is supplied to the main pipe P through the discharge pipe B2 and supplied to the consumption unit together with the petroleum gas generated in the heat exchange system 8.

この時、冷凍気体供給タンク１２に保存された冷凍気体は、液化石油ガスが供給される熱交換システム１０に供給され、超低温冷凍気体を生成する。この超低温冷凍気体は、冷凍気体貯蔵タンク１４に保存される。   At this time, the frozen gas stored in the frozen gas supply tank 12 is supplied to the heat exchange system 10 to which the liquefied petroleum gas is supplied to generate an ultra-low temperature frozen gas. This ultra-low temperature frozen gas is stored in the frozen gas storage tank 14.

この冷凍気体貯蔵タンク１４に保存された冷凍気体は、送風装置１６を利用して冷凍槽１８の底面に設置された噴霧ノズル２０を通じて噴霧される。廃タイヤ、廃ゴム、廃プラスチックなどの廃資源A１が冷凍槽１８に投入される。   The frozen gas stored in the frozen gas storage tank 14 is sprayed through a spray nozzle 20 installed on the bottom surface of the freezing tank 18 using the blower 16. Waste resources A1, such as waste tires, waste rubber, and waste plastics, are put into the freezing tank 18.

そうなると、冷凍槽１８に投入された廃資源A２は、噴霧ノズル２０を通じて噴出される冷凍気体Ｆの噴霧力によって継続的に流動し、そして最終的に、廃資源A２は粉砕できる状態となるまで冷凍される。   Then, the waste resource A2 thrown into the freezing tank 18 continuously flows by the spraying force of the frozen gas F ejected through the spray nozzle 20, and finally the waste resource A2 is frozen until it can be crushed. Is done.

廃資源A２が冷凍槽１８内で冷凍気体Ｆの噴霧力によって継続的に流動するので、廃資源A２の冷凍効率は最大となる。   Since the waste resource A2 continuously flows in the freezing tank 18 by the spraying force of the frozen gas F, the refrigeration efficiency of the waste resource A2 is maximized.

冷凍槽１８における廃資源A２の滞留時間、つまり、冷凍時間の調節は、冷凍槽１８及び噴霧ノズル２０の角度を変えて達成することができ、そのために冷凍槽１８及び噴霧ノズル２０は水平面に対して所定の角度で傾くように設置されている。   The residence time of the waste resources A2 in the freezer 18, that is, the adjustment of the freezing time can be achieved by changing the angle of the freezer 18 and the spray nozzle 20, so that the freezer 18 and the spray nozzle 20 are in relation to the horizontal plane. It is installed to tilt at a predetermined angle.

好ましくは、冷凍槽１８及び噴霧ノズル２０の角度を調節する角度調節装置（図示せず）がさらに設置されていてもよい。   Preferably, an angle adjusting device (not shown) for adjusting the angles of the freezing tank 18 and the spray nozzle 20 may be further installed.

したがって、冷凍槽１８に供給された廃資源A２は冷凍槽１８及び噴霧ノズル２０の噴霧角度に従って所定時間冷凍槽１８に留まり、移動しながら冷凍される。冷凍された廃資源A２は冷凍槽１８の側壁に形成された排出口２２を通って粉砕装置２４に供給され、再使用可能な原料A３に粉砕される。この再使用可能な原料A３は分離装置２６に供給される。   Therefore, the waste resource A2 supplied to the freezing tank 18 stays in the freezing tank 18 for a predetermined time according to the spray angles of the freezing tank 18 and the spray nozzle 20, and is frozen while moving. The frozen waste resource A2 is supplied to the crushing device 24 through the discharge port 22 formed on the side wall of the freezing tank 18, and is crushed into a reusable raw material A3. This reusable raw material A3 is supplied to the separation device 26.

この時、噴霧ノズル２０から噴霧された冷凍気体Ｆは冷凍槽１８の上部に設置された吸入管２８により吸入され、異物選別装置３０に供給される。   At this time, the frozen gas F sprayed from the spray nozzle 20 is sucked through the suction pipe 28 installed in the upper part of the freezing tank 18 and supplied to the foreign matter sorting apparatus 30.

粉砕装置２４に廃資源A２が供給されると、廃資源A２は噴霧ノズル１３の噴霧圧力によって若干の冷凍気体と混合される。この廃資源と混合された冷凍気体は粉砕過程で発生する熱を除去し、もって粉砕効率を向上させることができる。   When the waste resource A2 is supplied to the pulverizer 24, the waste resource A2 is mixed with some refrigeration gas by the spray pressure of the spray nozzle 13. The frozen gas mixed with the waste resources can remove the heat generated in the pulverization process, thereby improving the pulverization efficiency.

そして、粉砕された原料A３は若干の冷凍気体と共に分離装置２６に供給される。原料A３に含まれた異物及び冷凍気体は、排気ポンプ３２により、分離装置２６の上部に設置された選別装置３０に供給され、原料A３は自重によって分離装置２６に排出される。   The pulverized raw material A3 is supplied to the separation device 26 together with some refrigeration gas. The foreign matter and the frozen gas contained in the raw material A3 are supplied to the sorting device 30 installed on the upper part of the separation device 26 by the exhaust pump 32, and the raw material A3 is discharged to the separation device 26 by its own weight.

したがって、冷凍気体と原料A３に含まれた異物とは完全に分離され、原料は再使用可能となる。   Therefore, the frozen gas and the foreign matter contained in the raw material A3 are completely separated, and the raw material can be reused.

そして、分離装置２６から選別装置３０に供給された冷凍気体及び異物と、吸入ダクト２８で吸入された冷凍気体及び異物は選別装置３０において一緒にされて、異物は冷凍気体との比重差によって選別装置３０に累積されて除去可能となり、回収された冷凍気体は浄化機３４によって浄化された後、熱交換システム１０に再び供給されて冷却される。   The refrigeration gas and foreign matter supplied from the separation device 26 to the sorting device 30 and the refrigerated gas and foreign matter sucked in the suction duct 28 are combined together in the sorting device 30, and the foreign matter is sorted by the specific gravity difference with the frozen gas. The refrigerated gas accumulated in the apparatus 30 can be removed, and the recovered frozen gas is purified by the purifier 34, and then supplied again to the heat exchange system 10 and cooled.

従って、冷凍気体は継続的にシステムを循環するので、液化石油ガスの冷凍熱源を回収し反復的に利用することができる。   Accordingly, since the refrigerated gas continuously circulates through the system, the refrigerated petroleum gas refrigeration heat source can be recovered and used repeatedly.

本発明の好ましい実施の形態に係る廃資源の冷凍粉砕方法を示した概略図である。It is the schematic which showed the freezing and grinding | pulverization method of the waste resource which concerns on preferable embodiment of this invention.

Claims (5)

液化石油ガスと冷却気体との熱交換過程において液化石油ガスの冷凍熱源を回収することにより、冷凍気体を生成する冷凍気体生成工程と、
前記冷凍気体を冷凍槽に供給することにより、該冷凍槽に保存された廃資源を粉砕しやすい温度まで冷凍する冷凍工程と、
前記冷凍された廃資源を粉砕装置において粉砕する粉砕工程と、
前記粉砕された廃資源を分離装置に投入して、該投入された廃資源から冷凍気体を分離して、該分離された冷凍気体を再使用できるように回収する冷凍気体回収工程とを含むことを特徴とする廃資源の冷凍粉砕方法。 A refrigeration gas generation step for generating a refrigeration gas by recovering a refrigeration heat source of the liquefied petroleum gas in a heat exchange process between the liquefied petroleum gas and the cooling gas;
A freezing step of freezing the waste resources stored in the freezing tank to a temperature at which it can be easily crushed by supplying the frozen gas to the freezing tank;
A crushing step of crushing the frozen waste resources in a crusher;
A refrigeration gas recovery step of charging the pulverized waste resource into a separation device, separating the refrigeration gas from the input waste resource, and recovering the separated refrigeration gas so that it can be reused. A method for freezing and pulverizing waste resources. 前記冷凍気体は、−１７０℃で蒸気状態を維持できる窒素、酸素及びこれらを混合した混合気体から成る群から選択された気体で構成されることを特徴とする、請求項１に記載の廃資源の冷凍粉砕方法。   2. The waste resource according to claim 1, wherein the frozen gas is composed of a gas selected from the group consisting of nitrogen, oxygen, and a mixed gas obtained by mixing these, which can maintain a vapor state at −170 ° C. 3. Freezing and pulverizing method. 前記冷凍工程は、前記冷凍槽における廃資源に冷凍空気を噴霧して、該廃資源を流動させて冷凍効率を最大にする噴霧工程を含むことを特徴とする、請求項１に記載の廃資源の冷凍粉砕方法。   2. The waste resource according to claim 1, wherein the freezing step includes a spraying step of spraying frozen air on the waste resource in the freezer and causing the waste resource to flow to maximize refrigeration efficiency. Freezing and pulverizing method. 前記冷凍気体回収工程後、前記粉砕された廃資源に含まれた異物を比重差によって除去する異物除去工程をさらに含むことを特徴とする、請求項１に記載の廃資源の冷凍粉砕方法。   The method for freezing and pulverizing waste resources according to claim 1, further comprising a foreign matter removing step of removing foreign matters contained in the pulverized waste resources by a specific gravity difference after the frozen gas recovery step. 前記粉砕工程は、前記粉砕装置に冷凍気体を供給することによって、前記粉砕工程において発生する熱を除去して粉砕効率を最大にする熱除去工程を含むことを特徴とする、請求項１に記載の廃資源の冷凍粉砕方法。   The pulverization step includes a heat removal step of removing heat generated in the pulverization step to maximize the pulverization efficiency by supplying frozen gas to the pulverizer. Freezing and pulverizing method of waste resources.
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